Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 623, Issue -, Pages 386-392Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.11.100
Keywords
Grain boundary diffusion; Die upsetting; Nd2Fe14B/alpha-Fe nanocomposite magnet; Texture
Categories
Funding
- Natural Science Foundation of China [51101167, 60901047]
- National Science and Technology Major Project [2012ZX02702006-005]
- Program International Science and Technology Cooperation of China [2010DFB53770]
- Local Cooperation Project of CAS [DBSH-2011013]
- State Key Program of National Natural Science of China [50931001]
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The microstructure of die-upset nanocomposite magnets with different height reduction was studied to investigate the mechanism of texture development in processes of die upsetting coupled with Nd-Cu grain boundary diffusion. At beginning stage of die upsetting process, inhomogeneous Nd-Cu grain boundary diffusion results in two kinds of different grain boundary microstructures. As for adjacent grains with grain boundary phase, the stress-induced solution-precipitation underlies the formation of the platelet-shaped grains and texture enhancement. Whereas there are two types of texture enhancement for the neighboring grains without grain boundary phase: grain boundary sliding and grain devouring. As die upsetting further proceeds, the stress-induced solution precipitation is the dominant mechanism for texture enhancement due to fuller Nd-Cu grain boundary diffusion. (C) 2014 Elsevier B.V. All rights reserved.
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